Incandescent mantle.



PATENTED JULYv 19, 1904.

RJ. A. D'HEURBUSE. INGANDBSGBNT MANTLE.

APPLICATION FILED MAB. 19. 1903.

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INVELNTCR WlTN 5.5655

' A-rranegeys UNITED STATES Patented July 19, 1904.

PATENT OFFICE.

RIOHARD J ULIUS ALBERT DHEUREUSE, OF BERLIN, GERMANY, ASSIGNOR OF ONE-HALF TO THE FIRM OF HENRY HILL & OO., LIMITED, OF NOT- TINGHAM, ENGLAND, AND BERLIN, GERMANY.

INCANDESCENT MANTLE.

SPECIFICATION forming part of Letters Patent No. 765,179, dated July 19, 1904.

Appiaation tied Marot 19, 1903.

To (1U zzftcm 'ft may concern:`

Be it known that LRIcHARD JULIUs ALBERT DHEUREUSE, a resident of the city of Berlin, Kingdom of Prussia, in the Empire of Ger- 5 many, have invented new and useful Improvements in Mantles for Incandescent Lamps, of which the following is a full, clear, and exact specification.

This invention relates to improvements in IO incandescent mantles. It has been the practice heretofore to make these mantles of meshed or looped fabric-"the product of a knitting-machine-in order to provide elasticity of mesh, it being supposed that this I5 was necessary to allow for expansion and contraction consequent upon the heating and cooling of the same,'and thus prevent rupture of the threads. I havendiscovered, however, that this type of fabric is seriously objection- 2O able in that its very elasticity causes it to shrink and lose the dome shape so necessary to perfect candescence, thus lessening its illuminating quality, and that the contraction of the meshes, which increases with the period of combustion, has the effect of shutting off a period of the mantle fabric from the action of the flame, with the result that their illuminating effect is more and more affected and finally destroyed. To overcome these objections is the object of my invention, and

I accomplish it by producing a practically inelastic and unshrinkable mantle, for I have found that the elasticity heretofore deemed essential is not only not necessary, but an absolute detriment, and in the formation of my improved mantle I composev it bodily of threads orbers running vertically, bound together by threads or fibers running circularly and at right angles to the line of the longitudinal threads and binding them together.

It will be understood that this is for the purpose of preventing the stretching of the mantle, and for this reason the longitudinal threads must be vertically of the length of the mantle and the binding-threads horizontally of this .line, so that there can be no movement of the Serial No. 148,616. (No model.)

threads to cause the mantle to be distended longitudinally and to be reduced correspondingly in diameter, the aim of the present invention being tosupport and sustain the mantle in its proper shape, so as to give the greatest amount of illumination with the maximum durability.

In the present `invention every part of the fiber of the mantle is thoroughly exposed and the maximum illumination secured therefrom, due to the fact that there is no shrinkage, and by the simple arrangement of 'the crossing threads or fibers practically the whole of the fabric is made effective as an illuminant.

In place ofthe `meshed or knitted goods with multiple threads and loops a hoodshaped mantle is produced by the present invention having a body ,wholly consisting of a fabric in which the groups of bers are simply interwoven, one series or group running lengthwise ofl themantle and the other at right angles thereto, thus preventing the longitudinal stretching and lateral shrinkage found to be so objectionabie in practice and maintaining the mantle in the desired shape.

In the accompanying drawings, Figure l shows in elevation an incandescent mantle having a body constructed with threads or groups of fibers intel-crossing at right angles. Fig. 2 is a view of a modification.

a indicates an incandescent mantle of the ordinary shape, while Z; indicates the separate threads extending lengthwise in one group or-series with other threads interwoven at right angles or as shown in Fig. 2.

By the arrangement of the threads as shown a multiplicity of free passages or openings are formed allowing for the ready escape of the gases of combustion and a more perfect burning off of the mantle.

In addition to the advantages enumerated the internal support' given the longitudinal threads by the crossing fibers materially assists in increasing the ability of the mantle to resist jars or vibration and adds to its durability in cases where such mantles are remade substantially inelastic and unshrinkable maintaining in use its proper shape, substantially as described.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing Witnesses.

RICHARD JULIUS ALBERT DIIEUREUSE.

Witnesses:

VVOLDEMAR HAUPT, HENRY HASPER.

quired to withstand an increased pressure, l such as is necessary, for instance, in the case of strong-light and high-pressure gas.

I Claim- A hood-shaped mantle having' its body oomposed of a plurality of threads, fibers or filaments of ineandesoible oXids extending,I verl tieally the length of the mantle and bound together by continuous ilaments of oXids eX- tending` eireularly at an angle thereto and interwoven therewith, whereby the mantle is 

